/Engine/Source/Runtime/Slate/Public/Framework/Docking/TabManager.h
void PopulateTabSpawnerMenu ( [FMenuBuilder](API\Runtime\Slate\Framework\MultiBox\FMenuBuilder) & PopulateMe, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FWorkspaceItem](API\Runtime\Slate\Framework\Docking\FWorkspaceItem) > MenuStructure, bool bIncludeOrphanedMenus )